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Pocket-Sized 6 GHz 1 TS/s ET Scope

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joeqsmith:

--- Quote from: SJL-Instruments on January 24, 2024, 01:33:02 am ---Just to clarify: We could make a test fixture that outputs two synchronized fast rising edges. You'd then connect CH1 to one output, CH2 to the other, and click a button. Repeat with CH3,CH4,etc in place of CH2. This would compensate for any probe length mismatches. Would this fit the bill?

--- End quote ---

The probes themselves may have a fair amount of skew.  You could use a single output, rotating through each channel and then aligning them.   

A more pressing problem is that the new software does not always seem to catch the glitches.    They still appear to happen towards the start of the sweep as before. 

SJL-Instruments:

--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---The probes themselves may have a fair amount of skew.  You could use a single output, rotating through each channel and then aligning them.

--- End quote ---
The difficulty here is that CH1 needs to see a trigger to view any waveform on the other channels (so two outputs are needed). The solution we proposed aligns each probe to CH1 in turn (thus eliminating the probe-to-probe skew). Or perhaps we're misunderstanding your proposal.


--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---A more pressing problem is that the new software does not always seem to catch the glitches.    They still appear to happen towards the start of the sweep as before. 

--- End quote ---
Thanks for catching this - we'll see if we can reproduce this with extended testing. We've increased the urgency of the debugging/firmware fix. Do you ever see any glitches from the software after 12 ns?

***
And just to double-check - you are using v2.5.5 downloaded from the website, not any of the v2.5.5 pre-release versions we sent, correct?

joeqsmith:
One possible clue is that when I mentioned that the glitches are commonly negative, it seems to depend on the level of the signal when it first starts acquiring data. 

joeqsmith:

--- Quote from: SJL-Instruments on January 24, 2024, 02:00:42 am ---
--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---The probes themselves may have a fair amount of skew.  You could use a single output, rotating through each channel and then aligning them.

--- End quote ---
The difficulty here is that CH1 needs to see a trigger to view any waveform on the other channels (so two outputs are needed). The solution we proposed aligns each probe to CH1 in turn (thus eliminating the probe-to-probe skew). Or perhaps we're misunderstanding your proposal.
--- End quote ---

Yes, that is correct. I agree with your original proposal.     


--- Quote from: SJL-Instruments on January 24, 2024, 02:00:42 am ---
--- Quote from: joeqsmith on January 24, 2024, 01:53:37 am ---A more pressing problem is that the new software does not always seem to catch the glitches.    They still appear to happen towards the start of the sweep as before. 

--- End quote ---
Thanks for catching this - we'll see if we can reproduce this with extended testing. We've increased the urgency of the debugging/firmware fix. Do you ever see any glitches from the software after 12 ns?

--- End quote ---

I can't say for sure without an automated way to collect the min/max.  But, yes it does happen most often between 11 and 12 ns.   

joeqsmith:
To be clear again, my software makes no attempt to correct these glitches.  Your software may behave differently  What I can show you with my software is the min/max capturing six different events and they all occur prior to 12ns.   If I allow it to run long enough, I will see glitches in other areas but the majority happen towards the start of the sweep. 

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